code: def test_upper_function(self):
      function_name = "UPPER"
      execute_query_fetch_all(
          self.evadb, f"DROP FUNCTION IF EXISTS {function_name};"
      )
      create_function_query = f"""CREATE FUNCTION IF NOT EXISTS {function_name}
          INPUT  (inp ANYTYPE)
          OUTPUT (output NDARRAY STR(ANYDIM))
          TYPE HelperFunction
          IMPL 'evadb/functions/helpers/upper.py';
          """
      execute_query_fetch_all(self.evadb, create_function_query)
      query = "SELECT UPPER(input) FROM Test;"
      output_batch = execute_query_fetch_all(self.evadb, query)
      self.assertEqual(len(output_batch), 1)
      self.assertEqual(output_batch.frames["upper.output"][0], "EVADB")
  
      query = "SELECT UPPER('test5')"
      output_batch = execute_query_fetch_all(self.evadb, query)
      self.assertEqual(len(output_batch), 1)
      self.assertEqual(output_batch.frames["upper.output"][0], "TEST5")
  
file_path: evadb/test/integration_tests/long/functions/helpers/test_str_helper_functions.py
imports: import unittest
  from test.util import get_evadb_for_testing
  from evadb.server.command_handler import execute_query_fetch_all
label_desc: Use image node_id 3 for calling the StrHelperTest obj's underlying member method code with example usage: obj.test_upper_function() without return types